 All right, that was a long way to go. I'm Tim Commando, inviting you to join me every Saturday night from 9 p.m. to midnight on KSRM 920 AM and 92.5 FM. 35% of adults in the U.S. don't get enough vitamin D, reports the Cleveland Clinic. While D is naturally produced in the body when you're out in the sunshine and eat lots of meat and fish, not everyone can do that.